Definition of "stereoscope" []

• An optical instrument with two eyepieces used to impart a three-dimensional effect to two photographs of the same scene taken at slightly different angles. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""The first effect of looking at a good photograph through the stereoscope is a surprise such as no painting ever produced," Oliver Wendell Holmes wrote in 1859."
• "The first effect of looking at a good photograph through the stereoscope is a surprise such as no painting ever produced."
• "When shown on the device called a stereoscope or seen through glasses that polarize light, the two images blend in one picture that seems to have depth."